I just tested on Korora 20 (also a Fedora remix) and it works fine for me. Do you get any messages in the terminal when you start it? As you are running immediately after installing I'm guessing you are running it as root. What happens when you try to run it from a terminal as a user? Any errors, messages etc.?

There are a number of results come up when searching for that error but most are quite old. It used to require some Gnome packages but that was supposedly fixed several versions ago. It isn't clear from the error you're getting what is breaking it. Maybe a bug report on your distro would be a start.

yes! it looks as if it breaks right after the little window with root password.I just installed Fedora 20 on another HD & the same problem appears thus excluding a Freed-ora issue or HD corruption.Looks like a Bug...never done a bug report yet,but will do that.Thanks for your help & all the best to you in Australia.